| 1 | /* Copyright (C) 1997-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | /* clone() is even more special than fork() as it mucks with stacks |
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| 19 | and invokes a function in the right context after its all over. */ |
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| 20 | |
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| 21 | #include <asm/errno.h> |
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| 22 | #include <tcb-offsets.h> |
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| 23 | #include <sysdep.h> |
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| 24 | |
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| 25 | /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, |
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| 26 | pid_t *ptid, void *tls, pid_t *ctid); */ |
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| 27 | |
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| 28 | .register %g2,#scratch |
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| 29 | .register %g3,#scratch |
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| 30 | |
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| 31 | .text |
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| 32 | |
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| 33 | ENTRY (__clone) |
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| 34 | save %sp, -192, %sp |
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| 35 | cfi_def_cfa_register(%fp) |
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| 36 | cfi_window_save |
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| 37 | cfi_register(%o7, %i7) |
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| 38 | |
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| 39 | /* sanity check arguments */ |
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| 40 | brz,pn %i0, 99f /* fn non-NULL? */ |
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| 41 | mov %i0, %g2 |
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| 42 | brz,pn %i1, 99f /* child_stack non-NULL? */ |
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| 43 | mov %i2, %o0 /* clone flags */ |
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| 44 | |
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| 45 | /* The child_stack is the top of the stack, allocate one |
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| 46 | whole stack frame from that as this is what the kernel |
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| 47 | expects. Also, subtract STACK_BIAS. */ |
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| 48 | sub %i1, 192 + 0x7ff, %o1 |
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| 49 | mov %i3, %g3 |
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| 50 | |
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| 51 | mov %i4,%o2 /* PTID */ |
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| 52 | mov %i5,%o3 /* TLS */ |
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| 53 | ldx [%fp+0x7ff+176],%o4 /* CTID */ |
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| 54 | |
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| 55 | /* Do the system call */ |
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| 56 | set __NR_clone, %g1 |
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| 57 | ta 0x6d |
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| 58 | bcs,pn %xcc, 98f |
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| 59 | nop |
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| 60 | brnz,pn %o1, __thread_start |
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| 61 | nop |
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| 62 | jmpl %i7 + 8, %g0 |
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| 63 | restore %o0, %g0, %o0 |
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| 64 | 99: mov EINVAL, %o0 |
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| 65 | 98: call HIDDEN_JUMPTARGET(__errno_location) |
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| 66 | mov %o0, %i0 |
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| 67 | st %i0, [%o0] |
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| 68 | jmpl %i7 + 8, %g0 |
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| 69 | restore %g0,-1,%o0 |
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| 70 | END(__clone) |
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| 71 | |
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| 72 | .type __thread_start,@function |
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| 73 | __thread_start: |
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| 74 | mov %g0, %fp /* terminate backtrace */ |
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| 75 | call %g2 |
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| 76 | mov %g3,%o0 |
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| 77 | set __NR_exit, %g1 |
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| 78 | ta 0x6d |
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| 79 | nop |
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| 80 | |
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| 81 | .size __thread_start, .-__thread_start |
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| 82 | |
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| 83 | libc_hidden_def (__clone) |
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| 84 | weak_alias (__clone, clone) |
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| 85 | |
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